FM Stereo Coder (MPX Generator)

This is very simple stereo coder for FM transmitters. It’s published in some Greek electronic magazine. A friend of mine made a circuit board for it, I know that there is a little mistake, but can’t remember where exactly!!! It’s very cheap, but if you have suitable measuring equipment, it can be tuned to work really fine. I made few of them few years ago, and they still work in exciters.